Secondary or storage battery.



B. PCRD.

SECONDARY 0R STORAGE BATTERY.

APPLICATION FILED APR.22. 1908.

9499225 Patented Feb. 15, 1910.

l To all whom 'it may cou-cem:

UNITED sTATEs PATENT oEEijcE.

BRUCE FORD, OF- PHILADELPHIA, PENNSYLVANIA.

SECONDARY OR STORAGE BATTERY.

lle it known that I', BRUCE Fono, a citizen of `the United States, and residing at` Philadelphia, in the county of Philadelphia and State of Pennsylvania, have inv'nted eei-, tain new and useful Improvements in Seelondary or Storage Batteries,lof .which the l following is a specification. v

terms, consists in outwardl The principal object of the )resent iiivention is to improve the wooden oxes or c-.ises ot' .so-called portable stora e-batteries by increasing their durability in service, and to this end my invention, stated in general lieveling the top edges of the side pieces ot the box whereby their` top surfaces are covered tected by the sealing compound, and it confrom acid or moisture sists in providing a'n expansion joint in the bottom of the boxes which relieves them ot strain, and it consists in the improvements to be described andiinally claimed.

I n the-.drawin I have illustrated, principally in centra section, a so-called portable battery embodying vent-ion.

In the drawings 1, is a'box or case niadelof wood. 'The top edges of its side walls are outi'vardly beveled or cham-fered, andtthe sealing compound or clnunfered edges and thns'covers the top surfaces and protects the endsofthe -wood which may escape bottom of thebox features of the infroni the battery. At the is an expansion joint 5,l shown to consist of a with and pro-I Q., overlies these beveled Specification of Letters Patent. Patented Feb, 15, 1910, Application tiled April 22, T903. 'Serial No. 428,596.

tongueandgroove connection between the parts 3 and Il.' This joint by yielding prevents strains such as would be injurious" and such as might come about by reason of shrinking, warping or swelling of the wooden bottom.

6, is a hard rubber jar which contains the plates 7, and the electrolyte.

8, is a cover provided with a vent 9 and which is sealed to place by the compound 2.

1. In astorage battery the combination of an exterior box having 'the ends of its sides outwardly beveled 'or chainfered, a cover arranged beneath the ends, and a sealing coniponnd overlying the cover and the chanifered or beveled ends of the sides to protect the latter, substantially as described.

A storage battery box having an expansion joint in its bottom, substantially as described. y I

3. A storage battery box havingva tongueand-groove expansion joint in its. bottom, substantially as described.

4. A storage battery box having an expansion joint in its bottom and having the top edges'of its side walls chamfered, substantially as described.

In testimony whereof I have hereunto 

